AN UNUSUAL HETEROMORPHIC INCOMPATIBILITY SYSTEM

Abstract

Based on measurements of floral parts and experiments, Anchusa officinalis L. is shown to have a distylous breeding system. Dimorphism is found in the style length/anther height ratio, in stigma morphology and in pollen and corolla size. Plants are self‐incompatible but intra‐ and intermorph compatible. Long‐styled plants outnumbered short‐styled in all populations. Stigmas in short‐styled flowers receive a larger quantity of pollen than those of long‐styled.